Exhaust stud threads Log Out | Topics | Search
Moderators | Register | Edit Profile

Australian RR Forums » Silver Cloud & Bentley S » Exhaust stud threads « Previous Next »

Author Message
Top of pagePrevious messageNext messageBottom of page Link to this message

Benjamin Newman
New User
Username: cloudscc123

Post Number: 4
Registered: 7-2016
Posted on Thursday, 08 September, 2016 - 17:02:   Edit PostDelete PostView Post/Check IP

Can anyone tell me the thread size and type for Silver Cloud 57 six cylinder exhaust manifold studs? I need to fix a thread and would like to purchase the correct tap.

Also does anyone in Australia sell these studs?
Top of pagePrevious messageNext messageBottom of page Link to this message

christopher carnley
Unregistered guest
Posted From: 86.169.76.140
Posted on Friday, 09 September, 2016 - 02:27:   Edit PostDelete PostView Post/Check IP

It is 5/16" UNF, the SAE threads. The studs are high grade steel typically EN24 or 1%Cr 1%Ni, and quite difficult to drill out.
Introcar have them.

(Message approved by david_gore)
Top of pagePrevious messageNext messageBottom of page Link to this message

David Gore
Moderator
Username: david_gore

Post Number: 2197
Registered: 4-2003
Posted on Friday, 09 September, 2016 - 08:29:   Edit PostDelete PostView Post/Check IP

Benjamin,

Do not be tempted to use "high tensile" threaded rod from hardware stores to fabricate the studs as an alternative. These often come from low-cost manufacturers often in Asia and the quality control in their manufacture either leaves a lot to be desired or is non-existent. The OEM studs would be an alloy steel such as En24 [SAE 4340] or similar heat treated to SAE Grade 8 or equivalent specification.

I would recommend purchasing the studs from a recognised R-R/B parts supplier such as Introcar as suggested by Christopher.
Top of pagePrevious messageNext messageBottom of page Link to this message

Benjamin Newman
New User
Username: cloudscc123

Post Number: 5
Registered: 7-2016
Posted on Monday, 12 September, 2016 - 20:10:   Edit PostDelete PostView Post/Check IP

Thank you for the advice. For some reason I thought they may have been BSF sizes.

I had one snap inside the block, but have been successful in drilling it out. A 6mm Cobolt did the trick. The remnants I tapped out with a centre punch.. Got a new quality 5/16 UNF tap. All clean now.

I will purchase the real studs. Don't want to cut any corners. Thanks for the Introcar recommendation.
Top of pagePrevious messageNext messageBottom of page Link to this message

richard george yeaman
Grand Master
Username: richyrich

Post Number: 613
Registered: 4-2012
Posted on Monday, 12 September, 2016 - 21:55:   Edit PostDelete PostView Post/Check IP

Hi Benjamin there is nothing like a happy ending.

Richard.

Add Your Message Here
Post:
Bold text Italics Underline Create a hyperlink Insert a clipart image

Username: Posting Information:
This is a public posting area. Enter your username and password if you have an account. Otherwise, enter your full name as your username and leave the password blank. Your e-mail address is optional.
Please quote Chassis Numbers for all vehicles mentioned.
Password:
E-mail:
Action: